Skip to main content

VapoChill Puts a Pentium 4 with 800 MHz FSB within Reach

K.O. In The Final Round: Stability Stops After 750 MHz FSB

While our benchmarks should be familiar to you, the results require a little explanation. For starters, we weren't able to reach our goal of stable 800 MHz FSB. The system stopped being more or less stable after 750 MHz. With patience and some crashes in between, we also achieved the performance level at 800 MHz FSB.

This time, though, we didn't swap the processor, preferring to stick with the same model and its set multiplier (2.26 GHz with a x17 multiplier). That means that each uptick in FSB clock pumped up the processor clock and the RAM clock. The only clock speed we left was for PCI and AGP - at 33 and 66 MHz, respectively; the BIOS on the Asus P4G8X permits these settings. Since all clock speeds increased proportionately, we obtained wonderfully scalable results.

The following table explains the results in the benchmark diagrams:

CPUFSB ClockEff. CPU ClockMemory ClockAGP Clock
P4 2.26533 MHz2.26 GHz266 MHz66 MHz
P4 2.26600 MHz2.55 GHz300 MHz66 MHz
P4 2.26666 MHz2.83 GHz333 MHz66 MHz
P4 2.26700 MHZ2.98 GHz350 MHz66 MHz
P4 2.26750 MHz3.20 GHz376 MHz66 MHz
P4 2.26800 MHz3.40 GHz400 MHz66 MHz
P4 3.06533 MHz3.06 GHz266 MHz66 MHz
P4 3.06592 MHz3.40 GHz298 MHz66 MHz

We included a Pentium 4 3.06 as a control - to ensure comparability, we took one without HyperThreading. We also used this CPU to reach the 3.4 GHz touted by Intel the old-fashioned way: by overclocking the FSB from 133 to 148 MHz.